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3890473
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Information
Patent Grant
3890473
References
Source
Patent Number
3,890,473
Date Filed
Not available
Date Issued
Tuesday, June 17, 1975
49 years ago
CPC
H04M3/64 - Arrangements for signalling the number or class of the calling line to the operator
H04Q3/625 - Arrangements in the private branch exchange
US Classifications
379 - Telephonic communications
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